@book{144225,
	author = {Vásquez, Carlos E. and Martínez, Martha.},
	title = {Fundamentos de trigonometría},
	publisher = {Editorial Playor},
	year = {1988, c1985.},
	series = {Serie Ciencias},
	address = {Madrid},
	note = {At head of cover title : Cómo dominar la trigonometría.}
}